Many years of hard work_______ his great success in the development of this new type of material.

So ________ that all the living things are dying out gradually. [ ]

To_____ his position in the country, he appointed his close friend Henry as head of the troops

I’vedecided to go to London next weekend. I was wondering________ you could go with me.

I’m exhausted. I ______ on a design day and night.–You’d better have several days off after finishing it. Otherwise you might break down.